Table 4-4. digital i/o signal summary, Table 4-4, Digital i/o signal summary -8 – National Instruments PCI-4452 User Manual
Page 38: Digital i/o signal summary
Chapter 4
Signal Connections
PCI-4451/4452 User Manual
4-8
©
National Instruments Corporation
Table 4-4. Digital I/O Signal Summary
Signal Name
Signal
Type and
Direction
Impedance
Input/
Output
Protection
(Volts)
On/Off
Source
(mA at V)
Sink
(mA at
V)
Rise
Time
(ns)
Bias
DGND
DIO
—
—
—
—
—
—
+5 V
DIO
0.15
Ω
Short-circuit
to ground
1A
—
—
—
DIO<0..7>
DIO
—
Vcc +0.5
13 at
(Vcc
−
0.4)
24 at 0.4
1.1
50 k
Ω
pu
RESERVED1
DO
—
—
—
—
—
50 k
Ω
pu
EXTSTROBE*
DO
—
—
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI0/TRIG1 (EXT_TRIG)
DIO
—
Vcc +0.5
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI1/TRIG2 (PRETRIG)
DIO
—
Vcc +0.5
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
CONVERT*
DO
—
—
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI3/GPCTR1_SOURCE
DIO
—
Vcc +0.5
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI4/GPCTR1_GATE
DIO
—
Vcc +0.5
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
GPCTR1_OUT
DO
—
—
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
UPDATE*
DO
—
—
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI6/WFTRIG
DIO
—
Vcc +0.5
3.5 at
(Vcc -0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI7
DI
—
Vcc +0.5
—
—
—
50 k
Ω
pu
PFI8/GPCTR0_SOURCE
DIO
—
Vcc +0.5
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI9/GPCTR0_GATE
DIO
—
Vcc +0.5
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
GPCTR0_OUT
DO
—
—
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
FREQ_OUT
DO
—
—
3.5 at
(Vcc
−
0.4)
5 at 0.4
1.5
50 k
Ω
pu
DIO = Digital Input/Output
pu = pullup
DO = Digital Output
DI = Digital Input
Note: The tolerance on the 50 k
Ω
pullup and pulldown resistors is very large. Actual value may range between 17 and 100 k
Ω
.
User.book Page 8 Tuesday, April 14, 1998 10:20 AM